Oracle 9IAS Portal URL redirection

[J.D. Walker]

We have a machine running a portal with Oracle 9ias.
The machine is at
http://somemachine.subdomain.domain.tld
But when a user types in the full address at the prompt, and the pages come up, it gets redirected to:
http://somemachine/directoryname/pagename
where somemachine is the hostname of the machine. What can I do to stop this? I want the fully qualified domain name in the address bar at all times.
Thank you.
J.D.